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CECI Engineering Consultants Inc. Jimmy Chen, Patrick Chour, Tiffany Wang Overview 1. About CECI Engineering Consultants 2. Bus Stops for Swaziland - Tiffany 3. Fire Dynamic Stimulation in Taoyuan Airport - Jimmy 4. Different Soil Treatment


  1. CECI Engineering Consultants Inc. Jimmy Chen, Patrick Chour, Tiffany Wang

  2. Overview 1. About CECI Engineering Consultants 2. Bus Stops for Swaziland - Tiffany 3. Fire Dynamic Stimulation in Taoyuan Airport - Jimmy 4. Different Soil Treatment for Liquefaction - Patrick 5. Questions

  3. CECI Engineering Consultants, Inc. • Established in 1969 • 1760 employees

  4. Designing a Bus Stop for Mbabane Tiffany Wang

  5. Bus Stop Design Considerations

  6. Project Background ● Mbabane, Swaziland ● King Mswati III ● 94,874

  7. Right Now

  8. Design Process

  9. Structural Mechanics ● Steel ● Faux Wood Paint ● Photovoltaic ● Polycarbonate ● Wood

  10. In Real life

  11. Future Development

  12. Fire Dynamics Simulation in Taoyuan Airport Jimmy Chen

  13. Terminal 3

  14. Fire Dynamics Simulator Free software developed by National Institute of Standards and • Technology agency Branch of the U.S. Department of Commerce • Models fires and low velocity particles • Computational Fluid Dynamics •

  15. FDS Coding Setup

  16. FDS Rendering

  17. Evacuation Simulation

  18. Evacuation with Smoke

  19. Carbon Monoxide Levels

  20. Temperature

  21. Visibility

  22. What these results show Safe levels of CO • Safe temperature levels • Visibility is not an issue • Evacuation runs through relatively smoothly • Code can be tweaked for different scenarios •

  23. Different Soil Treatment Methods in Liquefaction Patrick Chour

  24. Geology of Taiwan 24

  25. Results of Taiwan’s Location Liquefaction • Soil losing substantial strength due to applied stress. • PWP generated during earthquakes cause the liquefied material (e.g. sand) and excess water to force its way to the ground surface. • Causes much of Taiwan’s land instability which leads to engineering design issues 25

  26. What is Liquefaction? 26

  27. Tainan Liquefaction 2-6-16 27

  28. Behavior of Liquefaction Ground surface Excess PWP Sand Water table Excess generated particle PWP Overburden Sandy soil Sand particle Sand particle 懶人包 Excess PWP Building stand Building tilt 29

  29. Numerical Analysis Profile Numerical Analysis Profile A B C D Sandy soil Excess-pore water pressure generated D Excess-PWP (KPa) C B Earthquake time history A Time(sec) 30

  30. Tainan Earthquake Simulation Tainan Earthquake Simulation 31

  31. Diaphragm Wall vs. Grouting

  32. Diaphragm Wall Diaphragm Wall Retain Soils during Construction ● Control Movement ● Performs support and reinforcement ● Reduce soil movement ● 33

  33. Diaphragm Wall Performance in PWP generation Diaphragm Wall installed Excess-PWP (KPa) Excess-PWP (KPa) original 18% improvement Time(sec) 34

  34. Soil Treatment Soil Treatment • Grouting After Before • Dynamic Compaction • Stone Column Ground Improvement 35

  35. Soil Treatment Performance in PWP generation Soil Treatment Performance in PWP generation Grouting Excess-PWP (KPa) Excess-PWP (KPa) original 139% improvement Time(sec) 36

  36. Original Diaphragm Wall Soil Improvement: Grouting 37

  37. Data Comparison Original Diaphragm Wall Grouting 38

  38. Conclusion • Taiwan Location results in preventive measures • Soil treatment gives better results than Diaphragm Walls • Soil treatment is more expensive, thus the use of diaphragm walls are more prevalent • Soil Treatment is not suitable to be used on existing buildings 39

  39. Questions?

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